Maybe someone has already posted this but I didn't find it in a search. If you need to run wheel spacers, particularly for a big brake kit then you should really run ones made for your wheels. The generic ones that will fit any wheel will allow movement (I was getting about 3mm of movement) and could cause your wheel bolts to shear. Hubcentric wheel spacers are what you want, in particular ones made for your exact wheel that you are running. I used these guys for mine and they were well priced and sent me a great product:
http://www.wheeladapter.com/wheel_ad...el_spacers.asp. All you need is to give them the measurements you need and they will machine a custom set of spacers. The ones I have are a friction fit so there is zero movement and are much safer, although they have to be tapped on with a plastic hammer, which is a bit of a pain in the ass.